/** 
* @description This plugin allows you to make a select box editable like a text box while keeping it's select-option features
* @description no stylesheets or images are required to run the plugin
*
* @version 0.0.1
* @author Martin Mende
* @license Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
* @license For comercial use please contact me: martin.mende(at)aristech.de
* 
* @requires jQuery 1.9+
*
* @class editableSelect
* @memberOf jQuery.fn
*
* @example
*
* var selectBox = $("select").editableSelect();
* selectBox.addOption("I am dynamically added");
*/

(function ( $ ) {
 
    $.fn.editableSelect = function() {
    	var instanceVar;
    	
    	this.each(function(){
	        var originalSelect = $(this);
	        //check if element is a select
	        if(originalSelect[0].tagName.toUpperCase()==="SELECT"){
	        	//wrap the original select
	        	originalSelect.wrap($("<div/>"));
	        	var wrapper = originalSelect.parent();
	        	wrapper.css({display: "inline-block"});
	        	//place an input which will represent the editable select
	        	var inputSelect = $("<input/>").insertBefore(originalSelect);
	        		//get and remove the original id
	        		var objID = originalSelect.attr("id");
	        		originalSelect.removeAttr("id");
	        	//add the attributes from the original select
	        	inputSelect.attr({
	        		alt: originalSelect.attr("alt"),
	        		title: originalSelect.attr("title"),
	        		class: originalSelect.attr("class"),
	        		name: originalSelect.attr("name"),
	        		disabled: originalSelect.attr("disabled"),
	        		tabindex: originalSelect.attr("tabindex"),
	        		id: objID
	        	});
	        	//get the editable css properties from the select
	        	var rightPadding = 15;
	        	inputSelect.css({
	        		width: originalSelect.width()-rightPadding,
	        		height: originalSelect.height(),
	        		fontFamily: originalSelect.css("fontFamily"),
	        		fontSize: originalSelect.css("fontSize"),
	        		background: originalSelect.css("background"),
	        		paddingRight: rightPadding
	        	});
	        	inputSelect.val(originalSelect.val());
	        	//add the triangle at the right
	        	var triangle = $("<div/>").css({
	        		height: 0, width: 0,
	        		borderLeft: "5px solid transparent",
	        		borderRight: "5px solid transparent", 
	        		borderTop: "7px solid #999",
	        		position: "relative",
	        		top: -(inputSelect.height()/2)-5,
	        		left: inputSelect.width()+rightPadding-10,
	        		marginBottom: "-7px",
	        		pointerEvents: "none"
	        	}).insertAfter(inputSelect);
	        	//create the selectable list that will appear when the input gets focus
	        	var selectList = $("<ol/>").css({
	        		display: "none",
	        		listStyleType: "none",
	        		width: inputSelect.outerWidth()-2,
	        		padding: 0,
	        		margin: 0,
	        		border: "solid 1px #ccc",
	        		fontFamily: inputSelect.css("fontFamily"),
	        		fontSize: inputSelect.css("fontSize"),
	        		background: "#fff",
	        		position: "absolute",
	        		zIndex: 1000000
	        	}).insertAfter(triangle);
	        	//add options
	        	originalSelect.children().each(function(index, value){
	        		prepareOption($(value).text(), wrapper);
	        	});
	        	//bind the focus handler
	        	inputSelect.focus(function(){
	        		selectList.fadeIn(100);
	        	}).blur(function(){
	        		selectList.fadeOut(100);	
	        	}).keyup(function(e){
	        		if(e.which==13)	inputSelect.trigger("blur");
	        	});
	        	//hide original element
	        	originalSelect.css({visibility: "hidden", display: "none"});
	        	
	        	//save this instance to return it
	        	instanceVar = inputSelect
	        }else{
	        	//not a select
	        	return false;
	        }
        });//-end each
        
        /** public methods **/
        
        /**
		* Adds an option to the editable select
		* @param {String} value - the options value
		* @returns {void}
		*/
        //instanceVar.addOption = function(value){
        	//prepareOption(value, instanceVar.parent());	
        //};
        
        /**
		* Removes a specific option from the editable select
		* @param {String, Number} value - the value or the index to delete
		* @returns {void}
		*/
        /*instanceVar.removeOption = function(value){
        	switch(typeof(value)){
        		case "number":
        			instanceVar.parent().children("ol").children(":nth("+value+")").remove();
        			break;	
        		case "string":
        			instanceVar.parent().children("ol").children().each(function(index, optionValue){
        				if($(optionValue).text()==value){
        					$(optionValue).remove();
        				}
        			});
        			break;
        	}		
        };
        */
       	/**
		* Resets the select to it's original
		* @returns {void}
		*/
		/*
        instanceVar.restoreSelect = function(){
        	var originalSelect = instanceVar.parent().children("select");
        	var objID = instanceVar.attr("id");
        	instanceVar.parent().before(originalSelect);
        	instanceVar.parent().remove();
        	originalSelect.css({visibility: "visible", display: "inline-block"});
        	originalSelect.attr({id: objID});
        };
        */
        //return the instance
        return instanceVar;
    };
    
    /** private methods **/
    
    function prepareOption(value, wrapper){
    	var selectOption = $("<li>"+value+"</li>").appendTo(wrapper.children("ol"));
    	var inputSelect = wrapper.children("input");
    	selectOption.css({
   			padding: "3px",
   			textAlign: "left",
   			cursor: "pointer"	
   		}).hover(
   		function(){
   			selectOption.css({backgroundColor: "#eee"});
   		},
   		function(){
   			selectOption.css({backgroundColor: "#fff"});	
   		});
   		//bind click on this option
   		selectOption.click(function(){
   			inputSelect.val(selectOption.text());
   			inputSelect.trigger("change");
   		});	
    }
 
}( jQuery ));